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Atomic Mass

Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.

1,752 Questions

Chlorine has an atomic number of 17 an an atomic mass of 34 when chlorine becomes the chloride ion its charge is what?

When chlorine becomes the chloride ion, it gains one electron to achieve a full outer shell, resulting in a charge of -1.

What is the atomic mass for Francium?

The atomic mass of the most stable and common isotope of francium, 223Fr, is 223,019 735 9(26).

What is the atomic mass number of hydrogen -3?

Hydrogen is a non meta element. Atomic mass of it is 2.

What elements have the atomic number 12 and atomic mass 8?

There is no element with an atomic number of 12 and an atomic mass of 8. Atomic number corresponds to the number of protons in an atom, while atomic mass is the sum of protons and neutrons. The atomic number of an element cannot be smaller than its atomic mass.

What element has a mass of 115?

Element 115 is Ununpentium, or Uup. It is also known as eka-bismuth. It is a placeholder in the periodic table, and we have not been able to synthesize more than 30 or so atoms of it since 2004. All of its half-lives are very short.

What is the atomic mass of calcuim?

The atomic mass of calcium is approximately 40.078 atomic mass units.

By definition one atomic mass unit is defined as 1 12 of the mass of a?

One atomic mass unit is defined as 1/12 the mass of a carbon-12 atom. This standard was established to provide a reference point for comparing the masses of different atoms. It allows for more precise measurements and comparisons in the field of atomic and nuclear physics.

How do you find the atomic mass of CO2?

To find the atomic mass of CO2, you need to identify the atomic masses of each element in the compound and then add them together. The atomic mass of carbon (C) is 12.01 amu, and the atomic mass of oxygen (O) is 16.00 amu. In CO2, there are two oxygen atoms, so you would calculate the atomic mass by adding 12.01 amu (carbon) to 2x16.00 amu (oxygen) for a total of 44.01 amu.

What is the atomic mass of orthophospharic acid?

It is known as Phosphoric acid

Molar mass 98.00 g/mol

What is the weighted average atomic mass of bromine?

The weighted average atomic mass of bromine is approximately 79.904 u. This value is calculated based on the natural abundance of bromine's isotopes.

What has atomic mass of 35.453?

The element with an atomic mass of 35.453 is chlorine.

An atom has an atomic number of 7 an atomic mass of 14 how many neutrons would it have?

To find the number of neutrons, subtract the atomic number (which represents the number of protons) from the atomic mass. In this case, the atom has 7 protons and an atomic mass of 14, so it would have 7 neutrons.

The atomic mass of a mole?

When isotopes are considered, they have the same atomic number but differed mass numbers.

What element in period 2 has a atomic mass of 11?

Short answer: boron.

Long answer: any element with 11 protons or less could theoretically have an atomic mass of 11, as the mass = Number of Protons + Neutrons, if you add/take a certain number of neutrons from the atom it will be able to have an atomic mass of 11, but some aren't possible and others are too unstable, and will decay instantly.

Why is boron's atomic mass 10.82 and not 11?

Boron has two naturally occurring isotopes, boron-10 and boron-11. The atomic mass of 10.82 arises from the weighted average of the isotopic masses and their abundances in a sample of boron found in nature. Boron-10 is more abundant than boron-11, causing the average atomic mass to be closer to 10.82 than 11.

How many atomic mass do krypton have?

47 neutron and 36 proton and 36 electron because its atomic number is 36.

If 75 percent of the isotopes of an element have a mass of 35.0 amu and 25 percent of the isotopes have a mass of 37.0amu what is the atomic mass of the element?

The atomic mass is calculated by averaging the masses of the isotopes based on their abundance. In this case, 75% of the isotopes have a mass of 35.0 amu and 25% have a mass of 37.0 amu.

Atomic mass = (0.75 * 35.0 amu) + (0.25 * 37.0 amu) = 35.5 amu.

The average atomic mass of the element cesium is approximately 133 you What is the mass of 3.00 mol of cesium?

The molar mass of cesium (Cs) is approximately 133 g/mol. Therefore, the mass of 3.00 mol of cesium would be 3.00 mol x 133 g/mol = 399 g.

If the atomic mass of a carbon is 12 amu 1 mole of pure carbon will have a mass of?

1 mole of carbon atoms will have a mass of 12 grams (atomic mass in amu is numerically equivalent to the molar mass in grams per mole).

What is the formula mass of nitrogen monoxide in atomic mass units?

The formula mass of nitrogen monoxide (NO) is calculated by adding the atomic masses of nitrogen (N) and oxygen (O). The atomic mass of nitrogen is approximately 14 atomic mass units (amu) and the atomic mass of oxygen is approximately 16 amu. Therefore, the formula mass of NO is 14 + 16 = 30 amu.

State which two elements from the first 20 elements of the modern periodic table are not arranged in order of increasing atomic mass?

Cobalt and Nickel are the two elements from the first 20 elements of the periodic table that are not arranged in order of increasing atomic mass. This is due to the placement of cobalt with a slightly lower atomic mass compared to nickel, which occurs due to the meticulous arrangement of elements based on their chemical properties and not just atomic masses.

Unit of atomic mass?

To convert mass to atoms:

Find the atomic mass of the element in the substance. You can find atomic masses on the periodic table. Ex. Lithium's atomic mass is 6.9 grams (round if you need to)

Then find the mass of the substance in grams. Ex. you have 18.2 grams of a sample of Lithium.

The mass of the sample is multiplied by 6.02 * 1023 and divided by the atomic mass.

Ex.

mass of sample in grams * (6.02 * 1023 atoms) / (atomic mass) = # atoms in grams

18.2 grams * (6.02 * 1023 atoms) / (6.9 grams) = 1.59* 1024 atoms

The number 6.02 * 1023 is Avogadro's Constant which is the amount of atoms (or molecules) in one mole.

How do you calculate the atomic mass of bromine?

To calculate the atomic mass of bromine, you would take the weighted average of the isotopic masses of bromine's isotopes, considering their relative abundance in nature. The atomic mass of bromine is approximately 79.904 u.

One atomic mass unit equals 931 MeV?

No, one atomic mass unit is equal to 931.5 MeV (mega-electron volts). This value is obtained by converting the mass-energy equivalence relationship (E = mc^2) where 1 atomic mass unit is equivalent to 931.5 MeV.

The atomic mass of Cu-63 is expressed to what number of significant figures?

The atomic mass of Cu-63 should be expressed to two significant figures, which are 63.